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Related Experiment Videos

A digital image microscopy system for rare-event detection using fluorescent probes.

B R Lee1, D B Haseman, C P Reynolds

  • 1Department of Pediatrics, UCLA School of Medicine 90024.

Cytometry
|May 1, 1989
PubMed
Summary
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A novel digital image microscopy (DIM) system reliably detects rare cells, even one in a million, crucial for cancer diagnostics. This technology aids in evaluating purged bone marrow and detecting minimal residual disease.

Area of Science:

  • Biomedical Engineering
  • Cell Biology
  • Medical Technology

Background:

  • Rare-event analysis requires sensitive detection of infrequent cells ( < 1:10,000).
  • Distinguishing true positives in cell clumps and excluding false positives is critical.
  • Existing methods may lack the sensitivity for detecting extremely rare cells.

Purpose of the Study:

  • To develop and evaluate a digital image microscopy (DIM) system for rare-event cell detection.
  • To assess the system's capability in identifying target cells amidst a large cell population.
  • To explore its application in cancer diagnostics, specifically for purged bone marrow and minimal residual disease.

Main Methods:

  • Development of a DIM system using an intensified video camera (ISIT) and a microcomputer-controlled microscope stage.

Related Experiment Videos

  • Scanning of cytospins containing up to 2 million cells.
  • Utilizing PASCAL software for stage control, video analysis, and data storage.
  • Employing Hoechst-33342 premarked cells in bone marrow as a model system for validation.

    • Main Results:

    • The DIM system successfully scanned 2 million cells in 24 minutes, with user confirmation averaging 5 minutes.
    • The system demonstrated high reliability, detecting one target cell per million bone marrow cells.
    • The system effectively excluded false positives and included true positives, even within multicell clumps.

    Conclusions:

    • The developed DIM system is capable of reliably detecting rare cells at a frequency of 1 in a million.
    • This technology holds significant potential for evaluating bone marrow purged of tumor cells before transplantation.
    • The DIM system is a valuable tool for the detection of minimal residual disease in leukemia and solid tumors.